<template>
   <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
     <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>商品管理</el-breadcrumb-item>
     <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning" :closable="false" show-icon>
      </el-alert>

       <!-- 选择商品分类 -->
       <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
            <!-- 选择商品分类的级联选择框 -->
            <el-cascader
            v-model="selectedcatekeys"
            :options="catelist"
            :props="cateprops"
            @change="handleChange"></el-cascader>
          </el-col>
       </el-row>
       <el-tabs v-model="activeName" @tab-click="handletabClick">
           <!-- 添加动态参数面板 -->
          <el-tab-pane label="动态参数" name="many">
            <!-- 添加参数的按钮 -->
            <el-button type="primary" size="mini" :disabled="isbtndisaabled" @click="adddiavisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manytabledata" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleclose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <!-- 参数名称 -->
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showeditdialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeparams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
          </el-table>
          </el-tab-pane>
           <!-- 添加静态属性面板 -->
           <el-tab-pane label="静态属性" name="only">
            <!-- 添加属性的按钮 -->
            <el-button type="primary" size="mini" :disabled="isbtndisaabled" @click="adddiavisible=true">添加属性</el-button>
             <!-- 静态属性表格 -->
          <el-table :data="onlytabledata" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleclose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <!-- 参数名称 -->
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showeditdialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeparams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
          </el-table>
          </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titlletext"
      :visible.sync="adddiavisible"
      width="50%" @close="adddialogclosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addform" :rules="addformrules" ref="addformref" label-width="100px">
        <el-form-item :label="titlletext" prop="attr_name">
        <el-input v-model="addform.attr_name"></el-input>
      </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="adddiavisible = false">取 消</el-button>
        <el-button type="primary" @click="addparams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titlletext"
      :visible.sync="editdiavisible"
      width="50%" @close="editdialogclosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editform" :rules="editformrules" ref="editformref" label-width="100px">
        <el-form-item :label="titlletext" prop="attr_name">
        <el-input v-model="editform.attr_name"></el-input>
      </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editdiavisible = false">取 消</el-button>
        <el-button type="primary" @click="editparams">确 定</el-button>
      </span>
    </el-dialog>
   </div>
</template>

<script>
export default {
  data () {
    return {
      //   商品分类列表
      catelist: [],
      //   级联选择框的配置对象
      cateprops: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      //   级联选择框双向绑定到的数组
      selectedcatekeys: [],
      //   被激活的页签的名称
      activeName: 'many',
      //   动态参数的数据
      manytabledata: [],
      //   静态属性的数据
      onlytabledata: [],
      //   控制添加对话框的显示与隐藏
      adddiavisible: false,
      //   添加参数的表单数据对象
      addform: {
        attr_name: ''
      },
      //   添加表单验证过则对象
      addformrules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      //   控制修改对话框的显示隐藏
      editdiavisible: false,
      //   修改的表单数据对象
      editform: {},
      //   修改的表单验证规则对象
      editformrules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  computed: {
    // 如果按钮需要被禁用返回true 否则返回false
    isbtndisaabled () {
      if (this.selectedcatekeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类id
    cateid () {
      if (this.selectedcatekeys.length === 3) {
        return this.selectedcatekeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titlletext () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
  created () {
    this.getcatelist()
  },
  methods: {
    //   获取所有商品分类列表
    async getcatelist () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类据失败')
      }
      this.catelist = res.data
    },
    // 级联选择框选中项变化会触发这个函数
    handleChange () {
      this.getparamsdata()
    },
    // tab页签点击事件的处理
    handletabClick () {
      console.log(this.activeName)
      this.getparamsdata()
    },
    // 获取参数的列表数据
    async getparamsdata () {
      // 如果选中的不是3级分类
      if (this.selectedcatekeys.length !== 3) {
        this.selectedcatekeys = []
        this.manytabledata = []
        this.onlytabledata = []
        return console.log('不是3级分类')
      }
      //   选中的是3级分类
      //   根据所选分类id和当前所处的面板 获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateid}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        console.log(res.data)
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      //   对res.data数据进行动态参数的数据或静态属性的数据判断
      if (this.activeName === 'many') {
        this.manytabledata = res.data
      } else {
        this.onlytabledata = res.data
      }
    },
    adddialogclosed () {
      this.$refs.addformref.resetFields()
    },
    // 点击按钮添加参数
    addparams () {
      this.$refs.addformref.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateid}/attributes`, { attr_name: this.addform.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.adddiavisible = false
        this.getparamsdata()
      })
    },
    // 点击按钮展示修改对话框
    async showeditdialog (attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateid}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editform = res.data
      this.editdiavisible = true
    },
    // 重置修改表单
    editdialogclosed () {
      this.$refs.editformref.resetFields()
    },
    // 点击按钮修改参数信息
    editparams () {
      this.$refs.editformref.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateid}/attributes/${this.editform.attr_id}`, { attr_name: this.editform.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getparamsdata()
        this.editdiavisible = false
      })
    },
    // 根据ID删除对应参数
    async removeparams (attrId) {
      const confirmres = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      //   用户取消了删除操作
      if (confirmres !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      //   删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateid}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getparamsdata()
    },
    // 文本框逝去焦点或按下enter键都会触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().lenth === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return console.log('输入的空格')
      }
      // 如果没有return证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求 保存着此操作
      this.saveattrvals(row)
    },
    // 将对attr_vals的操作保存到数据库
    async saveattrvals (row) {
      // 需要发起请求 保存着此操作
      const { data: res } = await this.$http.put(`categories/${this.cateid}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(',') })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    },
    // 点击按钮展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick的作用是页面上元素重新渲染后执行的回调函数
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },

    // 删除对应的参数可选项
    handleclose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveattrvals(row)
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
